<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        //catch方法
        let p1 = new Promise((resolve, reject) => {
            try {
                throw new Error('xxx')
                setTimeout(() => {
                    resolve(1)
                    console.log('数据请求成功');
                }, 2000)
            } catch (e) {
                reject(e.message)
            }
        })
        let p2 = p1.catch((reason)=>{
            return new Promise((resolve,reject)=>{
                resolve(1)
            })
        })
        console.log(p1,'p1');
        console.log(p2,'p2');
        //then方法
    
    </script>
</body>

</html>